143H and 163H Motor Graders Hydraulic and Steering System Scarifier Relief Valve Caterpillar


Scarifier Relief Valve
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Illustration 1g00008297

(1) Torque for nut with 3/8-40 thread on retainer assembly ... 12 ± 2 N·m (106 ± 18 lb in)

(2) Retainer Assembly

Note: Hold retainer assembly (2) when you are tightening nut (1).




Illustration 2g00008295

(3) Torque for nut with 9/16-18 thread on retainer assembly ... 20 ± 2 N·m (15.0 ± 1.5 lb ft)

Note: Hold retainer assembly (7) when you are tightening nut (3) .

(4) 4F-7115 Spring :

Color code ... Brown stripe
Test length ... 34.13 mm (1.344 inch)
Test force ... 223 to 262 N (50 to 59 lb)
Free length after test ... 42.86 ± 1.59 mm (1.688 ± .063 inch)
Outside diameter ... 11.9 mm (.47 inch)

Assemble valve (6) to relief valve body (5) at assembly. To install the valve manually into the seat of the relief valve body, use the spring (4) to guide the valve into the seat. To drive the valve manually, use a bolt that is the same diameter as the valve stem.

When you install the relief valve, lubricate seals with a thin covering of lubricant that is being sealed.

For proper relief valve pressure setting, the temperature of the oil should be 49 ± 3°C (120 ± 37°F).

Relief valve pressure setting ... 14200 ± 345 kPa (2061 ± 50 psi)

Oil flow ... 2.0 ± 0.2 L/min (.53 ± .05 US gpm)

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